There is a file glimglam.txt. I'm not sure if this is meant to be a singable Starlight-only version, or a leftover developer version (there is a difference between instglim.mp3 and instrumental.mp3, but Trixie is not very clear in instglim.mp3, so I'm not really sure).
Either way, the glimglam.txt still has duet tags, which the rest of the file is very clearly not.